| With the continuously strengthen of development level, current oil fields of my country have entered into high water-bearing stage especially Daqing oilfield, more and more scattered of remaining oil distribution and difficult for potential trapping. How to clearly know the distribution condition of remaining oil for enhancing recovery of old oilfields in high water cut stage and turning the passive situation in oilfield development has been a severe task faced by development workers.Using stratigraphic correlation method of closed skeletal plane well network, the Pu I group of Putaohua reservoir in study area has been divided into five sedimentary units such as PI1-4.Through analysised sedimentary features, we have knew that the research area have distributary plain,flood plain and delta inner front facies and established log phase mode of each microfacies. On the foundation of fine geological description about the research area reservoir, we use geological modeling software to establish attribute model such as reservoir structure, sedimentary facies, permeability, porosity, original water saturation and so on. According to dynamic monitoring data of development, this paper quantitatively studies the distribution of remaining oil by reservoir numerical simulation. At the same time, in static aspects, by using single well controlling area to calculate remaining geological reserves method, we have calculated it in different development stage of work area. After comparing with the results of reservoir numerical simulation, it shows that this method has high precision and provides a new fast method for researching remaining oil. At last, connecting with distribution of remaining oil saturation simulated by reservoir numerical simulation method and remaining geological reserves calculated by single well controlling area method, we can analysis remaining oil distribution rule, summarize the dominate factors and point out regulation and control direction of next time. |
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